为什么这些字符串比较在 java 中有不同的结果？

Question

This throws IllegalStateException, the checkArgument method is Google's com.google.common.base.Preconditions.checkArgument :

checkArgument(apikey.equals("3243442-bb73-123-421f-sfsglk"), "Wrong api key.");

vs.

This gets into the if block:

if (apikey.equals("3243442-bb73-123-421f-sfsglk")) {
    // do something
}

The apikey value is stored in the Spring boot config file and is retrieved by @Value("${apikey}") .

I know this is not how API keys are done, but I needed something quick for a small side project to test something.

Answer 1

Spring-Boot does not trim off the trailing whitespaces in the config files.

If you are sure the key is correct in the config file, this should pass the check:

checkArgument(apikey.trim().equals("3243442-bb73-123-421f-sfsglk"), "Wrong api key.");